package model;

import com.mysql.jdbc.jdbc2.optional.MysqlDataSource;

import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class DBUtil {
    private static DataSource dataSource = new MysqlDataSource();

//    静态代码块：随着类创建实例的时候，就进行加载
    static {
    ((MysqlDataSource)dataSource).setUrl("jdbc:mysql://127.0.0.1:3306/blog_system?characterEncoding=utf8&useSSL=false");
                                          //jdbc:mysql://127.0.0.1:3306/java106_blog_system?characterEncoding=utf8&useSSL=false
    ((MysqlDataSource)dataSource).setUser("root");
    ((MysqlDataSource)dataSource).setPassword("111111");
    }

    public static Connection getConnection() throws SQLException {
        return dataSource.getConnection();
    }

    // 释放资源，断开连接 操作
    public static void close(Connection connection , PreparedStatement statement, ResultSet resultSet) {
        // 需要先进行判断一下
        if(resultSet != null) {
            try {
                resultSet.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }

        if(statement != null) {
            try {
                statement.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }

        if(connection != null ) {
            try {
                connection.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
}
